high CVSS 7.5

CVE-2026-33154·Python vulnerability

dynaconf is a configuration management tool for Python. Prior to version 3.2.13, Dynaconf is vulnerable to Server-Side Template Injection (SSTI) due to unsafe template evaluation in the @Jinja resolver. When the jinja2 package is installed, Dynaconf evaluates template expressions embedded in configuration values without a sandboxed environment. This issue has been patched in version 3.2.13.

Severity
high
Software
Python
Fixed in
3.2.13
Published
2026-03-20

Affected versions

Until: 3.2.13

Fixed in: 3.2.13

How to fix this CVE

Upgrade Dynaconf to version 3.2.13 or later to patch the Server-Side Template Injection vulnerability in the @Jinja resolver. If you use Dynaconf for configuration management in Python applications, ensure jinja2-templated config values are no longer evaluated in an unsafe context. Patch your Python environment and redeploy affected applications immediately.

sudo dnf update python3-dynaconf && pip3 install --upgrade dynaconf>=3.2.13

Defensia detects this vulnerability

How to check if you are affected

  1. Run `pip3 show dynaconf` to retrieve the installed Dynaconf version and compare against 3.2.13
  2. Search your application code for @Jinja resolver usage in configuration files: `grep -r '@Jinja' /path/to/app/config`
  3. Check if jinja2 is installed as a dependency: `pip3 show jinja2` — if present, template injection is possible
  4. After patching, re-run `pip3 show dynaconf` to confirm version is 3.2.13 or higher

FAQ

What is CVE-2026-33154?

CVE-2026-33154 is a Server-Side Template Injection flaw in Dynaconf's @Jinja resolver that allows authenticated attackers to execute arbitrary code by injecting Jinja2 template expressions into configuration values when jinja2 is installed.

Is CVE-2026-33154 being actively exploited?

No, CVE-2026-33154 is not currently listed on the CISA KEV catalog and no public exploits have been disclosed, though the vulnerability has a high CVSS score of 7.5.

What versions of Python are affected by CVE-2026-33154?

All versions of Dynaconf prior to 3.2.13 are vulnerable; the exact affected Dynaconf release range is unknown, but upgrading to 3.2.13 or later eliminates the risk.

How do I check if my server is vulnerable to CVE-2026-33154?

Run `pip3 show dynaconf | grep Version` — if the version is below 3.2.13 and jinja2 is installed, your system is vulnerable.

Does Defensia detect CVE-2026-33154?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If Dynaconf is installed on a monitored server, CVE-2026-33154 will appear in your dashboard with remediation steps.

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References

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